IOCTL_INTERNAL_PARALLEL_PORT_ALLOCATE IOCTL (parallel.h)
The IOCTL_INTERNAL_PARALLEL_PORT_ALLOCATE request allocates a parallel port for exclusive access by a client. Before accessing port hardware, a client must first allocate it.
For more information, see Synchronizing the Use of a ParallelPort.
Major code
IRP_MJ_INTERNAL_DEVICE_CONTROL
Input buffer
None.
Input buffer length
None.
Output buffer
None.
Output buffer length
None.
Status block
The Information member is set to zero.
The Status member is set to one of the generic status values returned by internal device control requests for parallel ports.
Requirements
| Requirement | Value |
|---|---|
| Header | parallel.h (include Parallel.h) |